National Dental Examining Board of Canada (NDEB) Practice Exam 2025 - Free NDEB Practice Questions and Study Guide

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The most common cause of Class I malocclusion is

Thumb sucking

Tongue thrusting

Genetics

Inequity between tooth size and supporting bone

Class I malocclusion is a type of misalignment of the teeth where the upper and lower teeth do not fit together properly. It is the most common type of malocclusion and it is typically caused by inequity between the size of the teeth and the dimensions of the supporting bone. This means that there is a mismatch between the size of the teeth and the space available for them to fit in the jaw, resulting in a misalignment. While thumb sucking and tongue thrusting can contribute to a Class I malocclusion, they are not the most common cause. Genetics can also play a role in the development of malocclusion, but it is not the most common cause of Class I malocclusion.

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